薄板激光焊接质量在线监测系统

介绍了薄板激光焊接时，焊接质量在线实时监测系统及声、光信号的采集和处理方法、实验结果。该系统为高效率的激光焊接提供了可靠的质量保证。     

薄板激光焊接质量在线监测系统

介绍了薄板激光焊接时，焊接质量在线实时监测系统及声、光信号的采集和处理方法、实验结果。该系统为高效率的激光焊接提供了可靠的质量保证。     

液压系统油液在线监测技术研究

对液压系统的常见故障及常用监测方法进行了分析,提出将静电传感器技术运用到液压系统在线监测中;研究了液压系统油液在线监测机理、磨粒荷电量的影响因素;设计了一套适用于液压系统的油液在线监测系统;研究了磨粒浓度、大小及材质与传感器测量电压之间的关系.运用静电传感器在线监测液压系统工作介质中磨损颗粒的荷电情况,得到液压系统磨损的监测结果,验证了静电监测方法在液压系统在线监测中的有效性与可行性.     

站台门与信号系统接口故障在线监测系统设计

针对站台门系统与信号系统接口存在的故障问题,该文提出一种对双方接口命令信号实施在线监测的方案。通过采集双方接口命令信号,采集信号经过电路调理、隔离、放大、微控制器处理后传输到人机显示界面,最终以曲线图的形式将接口信号电压实时显示。该系统设计中采用信号隔离技术,降低监测系统对双方接口设备的影响。该监测系统在站台门系统工程样机上进行了测试,结果表明该系统能够准确、可靠、实时对接口信号电压正负值进行有效地监测,从而达到对接口信号的跟踪溯源,具有一定的推广应用价值。     

锅炉煤粉气力输送状态在线监测系统研究

煤粉气力输送状态在线监测对磨煤机工作状态以及锅炉炉膛燃烧安全、均衡和稳定性的评估具有重要意义.在理论研究的基础上,研制了一种基于激光脉动法和互相关法测试原理的锅炉煤粉气力输送过程参数在线监测系统,以实现煤粉气力输送过程状态的在线监测.该系统通过煤粉流经系统探头测量区时的激光脉动信号,经过光电信号转换元件、信号滤波以及数据分析处理后得到煤粉浓度、细度以及速度特征参数,进而评估磨煤机和煤粉管道运行状态.现场安装和测试结果表明,该系统具有测量精度高、成本低以及安装简便等特点.     

在线状态监测诊断系统在往复压缩机上的应用

往复压缩机在线监测系统对压缩机实时在线状态监测、故障诊断、预知维修具有重要作用。介绍BH5000R往复压缩机在线监测系统软硬件配置及功能,并通过诊断案例说明该在线监测系统的有效性和实用性。     

基于故障数据库的高速铣削诊断的研究

通过对高速铣削过程中各种铣刀状态下采集的振动信号进行时域、频域分析,对比不同磨损程度刀具的振动信号,找出与刀具状态对应的信号特征。基于LabVIEW平台,开发出在线分析监测系统。由于铣削加工过程的复杂性以及监测系统中得到的特征数据结构复杂、种类繁多,因此将数据库技术应用于在线监测系统中,从而实现对监测系统中数据有效集中管理,提高系统的即时反应速度和运行效率,实现对刀具状态的准确判断。     

基于LabVIEW的电厂在线监测系统

为解决邯钢电厂生产点多、各控制系统需要连接的工作量大以及生产工艺流程复杂、各分厂车间互相不完全协调的问题,以LabVIEW为平台,设计了一套电厂在线监测系统。其功能包括:数据采集、数据存储与分析、趋势分析、故障诊断等。首先设计了该系统的服务器,包括数据采集、数据存储、数据发布3个模块,然后设计了该系统的客户端,包括系统设定模块、即时信号显示模块、信号监测分析模块、故障诊断模块。在保证故障检测效率的条件下,该系统极大地减少了存储空间。实际使用结果表明,利用该监测系统故障发生前,可即时做出预警,故障发生后,可方便工程技术人员调用历史数据、判断故障原因并进行分析。     

超精密磨床振动和温度无线监测系统研究

开发了一套基于无线传输理论的精密磨床振动和温度无线监测系统,传感器和红外测温仪采集到的振动和温度信号接入相关的调理电路,经无线传输设备以一定的格式发送至远端的控制PC上.在状态监测控制端,基于Visual Basic 6.0开发的在线监测软件,显示振动信号幅域、频域处理结果以及温度信号的最高温度值和温度值曲线,以此判断机床是否处于正常工作状态.     

虚拟仪器技术在液压系统油温在线监测装置研究中的应用

依据虚拟仪器技术构造系统的软硬件结构,利用Labwindows/CVI软件开发平台,建立了一套基于虚拟仪器技术的集信号采集、分析和存储等功能为一体的油温在线监测系统.     

适用于光黏工艺的干涉仪公差保证方法

空间干涉测量系统是空间引力波探测的重要组成部分。本文介绍了一种全玻璃材料的差频激光干涉仪的组成结构和工作原理,对差频干涉仪中双相干光束的匹配对准难题,介绍了一种适用于光黏装配工艺的角度公差和位置公差保证方法。这种方法采用了监测系统和微量调整机构相结合的方式,首先,监控系统可以实现光线相对位置的实时测量,给出被调整光线的调整方向和调整量;然后,微量调整机构可以在平面移动和轴向转动3个自由度上,对目标器件实现微米量级的微量调整;监控过程和调整过程反复迭代,可实现对光学元器件的高精度位置控制和角度控制。实验结果表明,在调整方向上角度公差优于80μrad,位置公差优于85μm。本方案基本满足差频激光干涉仪的装配精度需求,为后续更高精度的装配奠定基础。     

The time resolution of a prototype neutron detector

The time characteristics of a prototype neutron detector designed for measuring the time of flight and determining the coordinate of the interaction point of a high-energy neutron on the detector have been investigated on cosmic rays. The time resolutions of the prototype neutron detector and the monitoring system are σ ≈ 0.7 and 0.2 ns, respectively.     

菲涅耳透镜对平行光的成像特性分析

利用光线追迹与实验的方法 ,对菲涅耳透镜在平行光照明时的成像特性进行了分析。给出了在各种角度入射情况下的最佳像点位置及像点弥散斑大小 ,通过对结果进行分析 ,得出了最佳像面曲线及其特征与参数。并讨论了它们与菲涅耳透镜参数的关系。     

Application of a diffraction grating and position sensitive detectors to the measurement of error motion and angular indexing of an indexing table

In this paper, two systems for the measurement of the error motion and angular indexing of a rotary indexing table have been developed. A laser diode, a laser holder and a position sensitive detector (PSD) are integrated as a simple measuring device for the measurement of the rotary error without using a precision reference artifact (a cylinder or a sphere), multiple probes or error separation methods. The laser diode is assembled in the laser holder and fixed on the rotary table. The PSD is set up above the laser holder to detect the position of an incident laser beam from the laser diode. When the rotary table rotates, the rotary error changes the direction of the incident beam and also the position of the spot on the PSD. For the measurement of the angular indexing, a reflective diffraction grating and two PSDs are integrated as a high-resolution angle measuring device without using an autocollimator or a laser interferometer system. The diffraction grating is set at the center of the rotary table and reflects an incident laser beam into several diffractive rays. Two PSDs were set up for detecting the positions of ±1st-order diffraction rays. A simple algebraic method is used to solve the angular indexing through an optical analysis. The experimental results showed the feasibility of the proposed test devices.     

激光切割板材的关键技术

CO2激光切割机在相关工业领域中已得到普遍应用，在CO2激光切割机对板材加工应用分析的基础上，对其设计和应用过程的一些关键技术如：焦点位置控制技术、飞行光路技术、切割穿孔技术、喷嘴设计及气流控制技术等进行了详细分析，使这一板材加工的技术得到更广泛的应用。     

Development of an optical three-dimensional laser tracker using dual modulated laser diodes and a signal detector

Laser trackers are widely used in industry for tasks such as the assembly of airplanes and automobiles, contour measurement, and robot calibration. However, laser trackers are expensive, and the corresponding solution procedure is very complex. The influence of measurement uncertainties is also significant. This study proposes a three-dimensional space position measurement system which consists of two tracking modules, a zero tracking angle return subsystem, and a target quadrant photodiode (QPD). The target QPD is placed on the object being tracked. The origin locking method is used to keep the rays on the origin of the target QPD. The position of the target QPD is determined using triangulation since the two laser rays are projected onto one QPD. Modulation and demodulation are utilized to separate the coupled positional values. The experiment results show that measurement errors in the X, Y, and Z directions are less than ±0.05% when the measured object was moved by 300, 300, and 200 mm in the X, Y, and Z axes, respectively. The theoretical measurement error estimated from the measurement model is between ±0.02% and ±0.07% within the defined measurable range. The proposed system can be applied to the measurements of machine tools and robot arms.     

Development of a simple system for the simultaneous measurement of pitch, yaw and roll angular errors of a linear stage

A simple measurement system has been developed and implemented for the simultaneous measurement of pitch, yaw and roll of the moving axes of a linear stage. This developed system is based on the principle of the diffractive theorem and optical triangulation. It is composed of a laser source, two quadrant detectors and a diffracting grating. The diffraction grating mounted on the moving axes of a stage reflects an incident laser beam into several diffractive rays and two quadrant detectors are set up for detecting the position of ±1st-order diffraction rays. When the diffraction grating moves, the locations where the diffractive beams are generated change and also the positions of the spots on two quadrant detectors. According to the relationship between the three angular motions of a moving stage and the output coordinates of two quadrant detectors, an inverse algorithm is used to solve these pitch, yaw and roll angular errors through a kinematic analysis .     

Small-Angle Acoustic Tomography under Shadow Testing with Antenna Arrays

Results of the experimental studies of an acoustic tract by the shadow testing method are provided. An inhomogeneous distribution of acoustic rays is revealed within the testing zone. The principle of producing a tomogram under small–angle probing is demonstrated. As a result of studying the error in determining the coordinates of flaws in different parts of the testing zone, it has been established that the least error corresponds to the flaw position at the center of the testing zone.     

基于物联网的辐射监测系统应用与研究

物联网是由各种技术融合而成的新型技术体系。物联网在多种应用中具有潜在、显著的技术价值和应用需求,放射性物质作为重点监控的危险品由于其射线不易检测,且半衰期一般都较长,一旦出现失控会对社会的公共安全造成严重的影响。文章通过研究与分析物联网相关技术,探讨对放射源采取实时的监测,并搭建监测平台实现对放射源的定位和剂量的在线监测。     

Andyrchy facility for detection of cosmic rays

The Andyrchy facility was created for studying the energy spectrum and nuclear composition of primary cosmic rays in the region of a knee in the cosmic-ray spectrum. The position of this facility above the Baksan underground scintillation telescope allows simultaneous detection of electron-photon and high-energy muon components of extensive air showers. The parameters of this facility also allow it to be used for solving a number of other problems of cosmic-ray physics. Data since 1996 have been collected for several physical problems. The facility is described, and its performance characteristics are presented.